Development and application of whet-slate used for machining pump barrel

Manufacturing subsurface pump barrel by cold-drawing and cold-rolling

用冷拔冷轧方法制造整筒式抽油泵泵管

The mechanical analysis on axial bending of pump barrel

有杆泵泵筒的纵向弯曲机理分析

Study on the variation regularity of fluid pressure in a pump barrel

抽油杆泵筒内流体压力变化规律水淹层地层水电阻率变化规律研究

Determination of the Machining Tolerance of Subsurface Pump Barrel Liners

抽油泵泵筒衬套加工公差的合理确定

Analysis and Solution of the Pump Barrel Leak of Ethylene Delivery Pump

乙烯输送泵泵壳泄漏故障分析及改造

To reach Tierra del Fuego at the tip of Argentina by April, as they had planned, they would need to cover four countries in eight weeks.

如果按照原定计划，他们必须要在八周内横穿四个国家，才能在4月前到达阿根廷最南边的火地岛。

They came to Tierra del Fuego at the tip of South America.

他们又去了南美洲南端的火地岛。

Most likely, they would stand at S Africa, Tierra del Fuego or the Falkland Islands, and Australia.

最可能的事，他们会驻扎在南非，火地岛或是弗兰克群岛，还有澳大利亚。

Using two Range Rovers, the British Trans-Americas Expedition leaves Alaska in December heading for Tierra del Fuego.

英国横贯美洲探险之旅就是开着两辆揽胜，十二月开始从阿拉斯加出发前往火地岛。

The profit and risk of loss remains within the principal, unless the agent is a del credere one.

委托人既享有利润有承担亏损风险，除非代理人为保付代理。

The user can then click on a census block to see an info window with a chart of the demographic makeup of the census block.

我们可以通过在查询所得到的图层上点击相应的街区来查看利用这个街区的人口数据生成的饼图。

China's population The most surprising demographic crisis A new census raises questions about the future of China's one-child policy

中国人口出乎意料的人口危机新的人口普查结果对中国独生子女政策的未来提出了质疑

This study of left-behind wives was based upon 0.95 ‰ sample data of the 2000 National Demographic Census.

本文利用第五次全国人口普查0.95‰抽样数据对2000年我国留守妻子的状况进行了研究。

Many developing countries are in the early stages of the demographic transition.

许多发展中国家正处于人口结构转型的初期阶段。

The change of population professional structure is one important variable of modern demographic transition.

人口职业结构的改变，是近代人口变迁的一个重要变量。

Demographic Transition in Modernization Process: A Macro-scale View

现代化进程中的人口转变：一个广义视野的考察

China's Demographic Transition and the Evolution of Population Policy

中国人口转变与人口政策的演变

Exploration on Family Planning Policy in Post Demographic Transition Period in China

后人口转变时期我国计划生育政策取向初探

The situation is analogous to Stage I of the demographic transition theory.

这相当于人口过渡论的第一阶段。

In China family planning policies had "accelerated the process of demographic transition".

在中国，计划生育政策“加速了这种人口过渡过程”。